I voted in for Bernie the Dem primary in 2016--but they cheated him out of the nomination anyway. In that way, I was able to vote against Hillary twice, once in the primary and once in the general.
This year Comrade Bernie is accepting donations as low as $2.70
The Florida D primary on March 17 may or may not mean anything. In order to participate, a voter must affiliate as a Dem at least 30 days beforehand.
Flipping back is very simple.